1.Bottom arc design: The bottom arc design is processed by machine milling and not damage the machine worktable after use. 2.Aluminum alloy material: The pressure plate gasket is made of aluminum alloy, achieving a 12.9 level screw with 300 times of locking friction and only wearing 0.1mm 3. electroplating treatment: The is electroplated to prevent rusting, making it sturdy, , wear-, and long-lasting 4.Rubber protective cover: Rubber soft texture protective cover provides excellent protection against scratches caused by friction, protecting the machine and desktop Color: Gold Material: Aluminum Alloy Package Contents: 4 x Quick Acting T-Track Clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.